Abstract
The self-assembly of organic 1-(2-pyridylazo)-2-naphthol (PAN) into hierarchical architectures, such as microfibers, microrods, and sheaflike structures, in solution was successfully achieved by reprecipitation method with the assistance of thermoresponsive diblock copolymer poly(N,N-dimethylacrylamide)-b-poly(N-isopropylacrylamide) (PDMA-b-PNIPAM). It was found that the morphology modification can be readily controlled by varying the polymer concentrations. The optical absorption and fluorescence emission properties of the as-prepared PAN architectures were investigated. Time-dependent spectra of the precipitating solution for sheaflike structures formation were measured to monitor the self-assembly process of PAN molecules. The results showed that the PAN microstructures exhibited intense fluorescence emission, indicating an unusual aggregation-induced emission enhancement (AIEE) phenomenon for PAN, which have great potential for future use in optoelectronic microdevices.
Highlights
Nano/microstructures based on small organic molecules have attracted considerable attention during the past few years due to the potential applications in diverse fields such as color-tunable display, field-effect transistors, chemical sensors, and optical waveguides [1,2,3,4,5,6,7]
In our previous paper [31], we have reported the synthesis of diblock copolymer PDMA-b-PNIPAM via reversible addition fragmentation chain transfer (RAFT) polymerization
To obtain PDMA-b-PNIPAM micelles, aqueous solution of the diblock copolymer DMA268-NIPAM243 with different concentrations was raised from room temperature to their micellization temperature
Summary
Nano/microstructures based on small organic molecules have attracted considerable attention during the past few years due to the potential applications in diverse fields such as color-tunable display, field-effect transistors, chemical sensors, and optical waveguides [1,2,3,4,5,6,7]. In recent articles dealing with the preparation of organic nano/microstructures, the reprecipitation method has become one of the most popular methods because of its easy and versatile operation [27,28]. From the viewpoint of applications, it would be greatly beneficial if the micelles self-assembled in aqueous media may respond to the external changes. This copolymer is well suited to act as a template for the fabrication of organic architectures. Hierarchical architectures of organic PAN were prepared through a template-assisted reprecipitation method. The optical properties of the prepared products were investigated by absorption and fluorescence spectroscopy
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